| http://www.w3.org/ns/prov#value | - Last year, NASA and university scientists released a study revealing that half of the airborne particles, or aerosols, in the skies above Canada and the United States come from foreign sources. (???he is a huge number ??? half.???) Indeed, analysis of satellite data showed that ???64 million tons of dust, pollutants, and other particles cross the oceans and mix into the air over North America eac
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